Bradford White 224-47776-07 Magnesium Anode Rod.
Size: 3/4" NPT x 46.61" Long
Replacing the anode rod in a water heater before it fails can slow down corrosion inside the tank and significantly extend the life of the water heater as it inhibit corrosion of the tank (cathode). The anode supplies electrons to the cathode and releases positive hydrogen ions and positive metal ions to the water. Release of the positive ions make the anode appear to dissolve which is a planned and expected situation. Consequently, the anode is frequently referred to as a “sacrificial rod and is the single most important factor in whether a hot water tank lives or dies.